According to McKee and Weir (1953), a bed is a sedimentary stratum greater than 10 mm thick, whereas a lamina is less than 10 mm thick. The divide at 10 mm is arbitrary, and not based on objective statistical analysis of stratal thickness, nor on any genetic implication. Beds and laminae are recognized on the basis of changes in sediment texture and/or composition within or between them. Beds and laminae generally occur in sets (bedsets, laminasets) that are distinctive in terms of the orientation, texture and composition of beds or laminae within the set (Figure B12). If the beds or laminae within a set are inclined at more than a few degrees relative to the set boundaries, the beds or laminae are given the prefix cross or inclined (e.g., set of cross laminae, or cross-lamina set). Bedsets or laminasets also occur in sets. For example, a set of similar cross-lamina sets or cross-bed sets is referred to as a simple set or coset (Figure B12), according to McKee and Weir (1953). A set...
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© 1978 Dowden, Hutchinson & Ross, Inc.
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Bridge, J.S. (1978). Bedset and laminaset. In: Middleton, G.V., Church, M.J., Coniglio, M., Hardie, L.A., Longstaffe, F.J. (eds) Encyclopedia of Sediments and Sedimentary Rocks. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-3609-5_24
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